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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac774bdb215485cb344c0256b0d53e5fae478630cafa5399cc4a43b32b9a63e' 
  AND token = 'matheci6F6W2zFP1wF8ese1lOB6dqIR1kDrfyGv6Ua0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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