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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbe4b4d088967769c5625078b0f5d4ab14a607919abfb8371f7a9763f0d0d02' 
  AND token = '0jCdPTlEEjOWyLma/edZrey8IB4F2+PTOYbf377gIVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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