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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'effc7239ee7e0fa7f54e9b07d67bc046db21e0299275882afddc73cd53b91d04' 
  AND token = 'Oebk3yM5sYjvLSBPd8y4VGc/Di8R4DnsyOY+WysrnpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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