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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d282dc04cf01a4409f4404701a4511b9fed21db3ff22e079736a14140eaa840' 
  AND token = '0tu3RTcmaP5Vi7Tt8umCvLMUPJkYKK3wr2DGuU4HfBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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