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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c237f32c423758ca82edadcb2455bef8941af3e7c42479ef543255dab0540d87' 
  AND token = 'ygIA++mlw+wPFQbN1XrgziyPt4t8bnWoN3kxm5u/rW8=' 
  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"
    }
  }
}