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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb7bc4e3d2289a1af08577556e83b93b8615f85c9ab2d38a976203016b3e9c0' 
  AND token = 'Jevfp3urAj8iWKP1OYd6GTE1khepgKgJuaM6/BLrvcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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