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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e270507757bcaa3318c3039ac7244baa8db8f8099c0b1e62dc3845ccbadaaf6' 
  AND token = 'KcTjqlX9DoP2AeE5AztGZ0YMJhbTz/AjQavUKXWwP1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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