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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5bc38be3b15ef7ca307d5c7e7d0fcf72111dc30d6e9d87d190ef857f9373fb' 
  AND token = 'n0ROHkosUIXTekeTyi8p04wVP844rhNTaOjsWYL10lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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