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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec106e9b2e55433c089f28b20d73fb4369a9134f0ca90a7ab5aff9ff96ab44de' 
  AND token = 'FHi39s1Xuf+j84AJp7/bH/4ToRoI5xDTkqrTHt4y9Kw=' 
  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"
    }
  }
}