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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c03ab528c83942861019e3fb17fa2173d6b1b77db937dc7c66498141e0f961' 
  AND token = '68M/JioApH40Ng8fpCagsjNsOuWjdp14EThHK/HsqBc=' 
  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"
    }
  }
}