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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e42d04adc91e370e1d574de203d16582bbf56e78c44c523ef58131051cfd6fd' 
  AND token = 'o1akkAzOq5t4jwxyBgk37kVTkQLoh+M5SKuF26txOoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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