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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ef37e8756514e462ee4d04ca16153367f6b757e9eefbca73ad4503169a05a8f' 
  AND token = '4a6MOoB04xHmmuywu/HL0rYFH2rW3yo2MgjJbdbu+Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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