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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0c8627a406e135c36c5a734c3f7b7216aa4e2220ea14988a77dbc554b7c6c2b' 
  AND token = 'a6dtOkMG97zApQiw1YED8n50+JJmoQqSH0gt1LR6mR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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