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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4150a6f58d699c74e93bdc14c425722aa0b3d5bd76d7c791c794c4456e61f4b5' 
  AND token = 'MDHrO68ZpdD8o+SZ24v2dwBs51BXyr41iiIDNpG4tNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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