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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1944390d2db094ee49bd722398832cbe31c03dd3ab7d54eb3e5a6b70420734' 
  AND token = 'n/KwHpCG9nBL7sZ+8PRTwk7Rd86+JMeXe97f4A+UTJY=' 
  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"
    }
  }
}