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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26da4add5f4a38cd83faf4541ff75d8396a466782b3adc23c4fcf13e231aecf7' 
  AND token = '7Xj3R9LIg01D4J1wgdL5l1Qia4I1YfcerSZ9TH8bo3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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