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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea596571659c1da86e0df35e6dec93749e11049cc6e5d148f3963631fa05765' 
  AND token = 'w1WzvKQbqpo21Xfantsha7CEk54w4fTCU3XYGMe2N3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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