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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd14760607fe9d3da059879657abe97b13c2885fd57b35a72859c5ef3d2ef6a0' 
  AND token = '3+5yxwP2SjoLA8+P7CbbbGBepSwPwmMsZTu9653CzH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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