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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c778d3b65463dda358c8b020c6e20d6ab3cc4aba8c3d63842a64048d1a4f3c7a' 
  AND token = '6EQKyYC5+qKjmqfIQETIRVjg6wkKN+8CIG+q3lvOvZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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