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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03dc1a9ea8f3fbf7bfac5c39e130535b81814a6ea9eaff0ae05aa3dcbbc8d82' 
  AND token = 'DYw6g8QSsDWLHzOPiRcL8qXoPRHwwN7yc0/i29qtU3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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