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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7887f1faad35eddc0824df87a73ed7b7f48e1f3f1cd2b20f1f0200bdb3bee5' 
  AND token = '9MTJFOM9Pz0oKSpB1tuFe0VCr2iPaJ4DLXw3RBLLV3o=' 
  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"
    }
  }
}