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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5c09402bbdfe06c68f8a6337588ff9e2c2a77f2ee4a86b9d0aac6a590755ee' 
  AND token = '5C7T16KgJjvEBVDs6XiFxJNIB6Vd4AmlFpfxu7+ph8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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