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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9890cd7699d51acb97f70164227b2cec3ef8fb56752ba4191a67c1648e691b7' 
  AND token = 'ak80rFcT7FQ/F0jLe5eJjZG37Hu6WWc2tJVt3i4M524=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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