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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5703520e91c20a0920469ebe60af2af8eb40fb4a30f590df73dbcb3213c8bd' 
  AND token = 'YsR/G/UGRJYdsiJAQ401l1eEKQX/Bga03QQ4eODQn7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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