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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f0c782e6ad9525cdcdecfe814337d04a8484f8ea99a734e15a7722c13155e6' 
  AND token = 'Vp5JwtRRhh8huMnZ47gULAXLR83gyeIrnptIeIeYHmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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