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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b9ef5d134955e8b1a3783234c9b76f0b3710cd03103870ce8a44209660f723' 
  AND token = '4EIL32UVUpbYc6EPxYRSUFfAIfTwozfKXHW7l7aQ+0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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