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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9862fc602f8e6f5f85b9bb70ebb9b7466dad5c3904ad8e07da04d74bc9c3b9e' 
  AND token = '2cGuLx2pMg6vZQk8An0wgNw9hms+5PxXZGvPekK9CRs=' 
  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"
    }
  }
}