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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b457e927ea00a3401b32a798f1f4536cff620ccf3ad9a1c9f5b1c27931490ed' 
  AND token = 'cOYmDYlfTkPhgW1KMMgDrpLAeTykZgQlcOpTh0lpMEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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