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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052fb04d8d567aaba11c3103c0146068d9f7de15053a3b6106a91d7d8a37c61e' 
  AND token = '+VEm1kV1ibGC8o1ULsM1k2HHMTgM0FxBJ5NJwZRFbzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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