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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54841dc20770d7a0a7891e4d9754fa0a28c0c9d2f00a05fc668b4890069dd06d' 
  AND token = 'v2AYHAZICTLcyqCvFMTPP90ssTC1QxpV6V1fseGhB8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}