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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c2f6a980ba816be757ab416719d29a62ee614469ec8016bdc89cb0d2e86cf3' 
  AND token = 'b4RJg8SE5bnuYFR/Sp3PgyutKeFE5AMtQBh1ZXJXHCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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