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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b3b8058a373ecf04b00f437c5fab7e98bb2b1909f268776604bd35f51f0220' 
  AND token = 'nA1am3jtGOib3b0v9NAs3ViPRQg8ELlelu2rJ3F64TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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