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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd70f5d5a9f05aed74d19cff40057785c8145fd4380fddcd07bc254fe4d0bd20b' 
  AND token = 'DWDWT88xggEM/yp3eHkVkiaXi4jlzeSYwz56+HvzamQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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