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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d3d6b4b5c6f56df532885b0cb2fc1207af759267e38fb685cd1adf19ea7878' 
  AND token = 'U+aM5kIy3xo+S2xQlIYgcp/dJQ/b0aKghDCI3jp3mPE=' 
  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"
    }
  }
}