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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfeeeb3331036b5c7a6408d5018555c79357d6ae0332c7e163be0ffbfe257d0b' 
  AND token = 'z0m6MOckPxGB5JnaG1tAaP7vmMpPB9FQZ2govZ7/YLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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