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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd409721cb9747110b014c7d967b2c7f139b3c5fb901cddbd79d8f8ea0eeae13a' 
  AND token = 'RR45t+ZUzgoGqHgH1S//MRYGLXezs4jS17HiN6h1TMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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