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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d80235a7add7bd20b2c888a60409b57ac190d739f680bcad7cfb6a6ba856cc6' 
  AND token = 'MHL+dl502Y5BROjhQnVDtDTi6a2HDF1sin+l5wFF9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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