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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d975193cd62fdde4ebb48138c0e4b5d62590e0832a6704f2f6739c36e22e0f2' 
  AND token = 'lkmfUCGG4ujg9pgadqMJFNdC31ziYeQ1DqyGSOAcLJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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