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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e0d3b3469558f11a6dd5551d9cc43a1a0b000df2ac1ef9a2cf2ac25caffc4e' 
  AND token = 'OBEQcSG99wWp1uBx12b9WIypxI5AAX0bgplMtfqPNKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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