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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e8b02064827ca999cde4131ce240ff63a1efe7ec941a017219b30972719983' 
  AND token = '7LWYWqdrOB0Otf5uyqDWF4Zz1160EF5zpYL3r7gvEeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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