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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '253c9343061efe545b7fab42e8980569be827c4e06f1d7b3965d46e1960db8b2' 
  AND token = 'Eq08Qfx8Eu2qv4s9NL/eeTwx+SJjoeXhMfPZl0VU2xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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