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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c504cdfee6dd2e1a0462e18849048c8dc1c4287554e0c341b0caa803bdeb5713' 
  AND token = 'G01qk/ie6BbVLJSm9bwAG3M6kG5yH4mvPANyDy0b2io=' 
  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"
    }
  }
}