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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0d7232391f88d3b4b4a9e8032712c473b0c5d46ee58e592faef8c629ed74ab' 
  AND token = 'bpo00aHG1ftNNAbDOWNsNUKYEVD8ENSzMxtv1LaTacc=' 
  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"
    }
  }
}