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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eced0cd4fc79e376a48621e8ca5cfaa1f0360db9a75fd14ff5e1273afd50aa50' 
  AND token = 'vtn0/K14PDx4RZJ8g/rM0Uqdv7kl/CR8owMret7Gl34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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