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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45dbebacf0896d3d09166c16dae28e2e021c10843d0b6da82b9f911f04dee07f' 
  AND token = 'GrAnhMN2klAk0Trhsljh6pnY8S9Ha8qZdzUiSUuBQ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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