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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642955fa744251fb032d829ef20aa3e854b9b53491a64352268150e3ca61e086' 
  AND token = 'obS9eqCHkKulJrXqkYUj8FGosUVxmHQDiX0t1S2lseI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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