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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20ab803dca75e153786f2b4fda0a8759e1a33c5d0ad86c5a78e9069e20b3c7d' 
  AND token = 'oEbFnvO6CX0M6935x7yIVLa52WD/e4o/NY9L7VSP5n8=' 
  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"
    }
  }
}