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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef2abff178e4ecf2e658090a2997e7eb124519fd69df5784ffbeab4eab54986d' 
  AND token = 'v76oj+pUOamJKDA7+Rb6o9zubSHk0zkXXD/X2nFBp2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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