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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f20fea31df03eca891c250fb9995bc27fcf12e76bbd885dcfcee4cc0ddc7af' 
  AND token = 'f94+S9S12Q1oErI9zdcGkYS1qR/eBiR0w3ssFW7z2LY=' 
  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"
    }
  }
}