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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1e31fcc5168908557c31e1eb06c19d9ccb99b4ec4147e0c59d9e75182cb191d' 
  AND token = 'TsBS/bj44Qzgha9w1QhY3H5OxMFK2RKeWmDufBeQvDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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