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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f497bcdfb3a584dadb962b06a66a2b427e50473edf0804d0f902daf14d6f12d3' 
  AND token = 'LIc+Q8HgwZ+m/+D8c+q+4dy9L/moeD+iHcvz6KqGCwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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