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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c707b0c9af1d0cf8d211169d6246a448c7be7b94facbfee352ab3471f96b9f6' 
  AND token = 'ZF/T9VCPVPweZKLfXtU45X+1v18aHxrQxoGko9AdiZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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