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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d83c1f2ee9e3d9f88eb258e25ad663c8964e12aab9bd7b90408aa6ee25209e8' 
  AND token = 'D8Kuhl9D6x/I8rZ7o0uARV8Gv19zmT9snUusueNppkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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