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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ba8fd354ef2403f5b427b1474a02451bde633af3f320cf64e4d0a7e3a54013' 
  AND token = '09RCF0vO87IHrlhaBTUbOVYdR93RFDiRpBJx45oIi/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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