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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e841fd6f2c634ec3a59dcfcf88c9c2e9fd177b94f1e6a5c99b26964e5eb461b' 
  AND token = 'aAxAn0Isy7f3GvtpBfJnLNcM5cYM5+Ph7AUeX09Swg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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